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dnl x86 calling conventions checking.
dnl Copyright 2000, 2003 Free Software Foundation, Inc.
dnl
dnl This file is part of the GNU MP Library.
dnl
dnl The GNU MP Library is free software; you can redistribute it and/or
dnl modify it under the terms of the GNU Lesser General Public License as
dnl published by the Free Software Foundation; either version 3 of the
dnl License, or (at your option) any later version.
dnl
dnl The GNU MP Library is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
dnl Lesser General Public License for more details.
dnl
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
include(`../config.m4')
C void x86_fldcw (unsigned short cw);
C
C Execute an fldcw, setting the x87 control word to cw.
PROLOGUE(x86_fldcw)
fldcw 4(%esp)
ret
EPILOGUE()
C unsigned short x86_fstcw (void);
C
C Execute an fstcw, returning the current x87 control word.
PROLOGUE(x86_fstcw)
xorl %eax, %eax
pushl %eax
fstcw (%esp)
popl %eax
ret
EPILOGUE()
dnl Instrumented profiling doesn't come out quite right below, since we
dnl don't do an actual "ret". There's only a few instructions here, so
dnl there's no great need to get them separately accounted, just let them
dnl get attributed to the caller.
ifelse(WANT_PROFILING,instrument,
`define(`WANT_PROFILING',no)')
C int calling_conventions (...);
C
C The global variable "calling_conventions_function" is the function to
C call, with the arguments as passed here.
C
C Perhaps the finit should be done only if the tags word isn't clear, but
C nothing uses the rounding mode or anything at the moment.
define(G,
m4_assert_numargs(1)
`GSYM_PREFIX`'$1')
.text
ALIGN(8)
PROLOGUE(calling_conventions)
movl (%esp), %eax
movl %eax, G(calling_conventions_retaddr)
movl $L(return), (%esp)
movl %ebx, G(calling_conventions_save_ebx)
movl %esi, G(calling_conventions_save_esi)
movl %edi, G(calling_conventions_save_edi)
movl %ebp, G(calling_conventions_save_ebp)
movl $0x01234567, %ebx
movl $0x89ABCDEF, %esi
movl $0xFEDCBA98, %edi
movl $0x76543210, %ebp
C try to provoke a problem by starting with junk in the registers,
C especially in %eax and %edx which will be return values
movl $0x70246135, %eax
movl $0x8ACE9BDF, %ecx
movl $0xFDB97531, %edx
jmp *G(calling_conventions_function)
L(return):
movl %ebx, G(calling_conventions_ebx)
movl %esi, G(calling_conventions_esi)
movl %edi, G(calling_conventions_edi)
movl %ebp, G(calling_conventions_ebp)
pushf
popl %ebx
movl %ebx, G(calling_conventions_eflags)
fstenv G(calling_conventions_fenv)
finit
movl G(calling_conventions_save_ebx), %ebx
movl G(calling_conventions_save_esi), %esi
movl G(calling_conventions_save_edi), %edi
movl G(calling_conventions_save_ebp), %ebp
jmp *G(calling_conventions_retaddr)
EPILOGUE()
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